Lathe



7 March 13, 1928.

1,662,561 s. E. BOYNTON I LATHE Filed July 1923 5 Sheets-Sheet 21 March 13, 1928. 1,662,561

s. E. BOYNTON LATHE Filed July 1923 3 Sheets-Sheet 2 March 13, 1928. 1,662,561

S. E. BOYNTON LATHE 7 Filed July '7, 1923 3 Sheets-Sheet 5 Patented Mar. 13, 1928. V UNITED STATES o 1 1,662,561 PATENT OFFICE.

STANLEY E. BOYNTON, OF OAK PARK, ILLINOIS, ASSIGNOR TOCHARLES EVREED, OF I MGHENRY TOWNSHIP, ILLINOIS.

LATHE.

Application filed July 7,

My invention relates, more particularly, to copying lathes, which operate automatically to form an object, as, for example, a wood blank, into the same shape as a pre formed pattern, though my invention is not limited, as to certain phases thereof, to socalled copying lathes.

My primary object is to provide in a copying lathe involving the use of both roughing and finishing cutters, for the ad uStment of the roughing cutters into different positions as the character of work to be produced varies, in order that the roughing cutters shall operate to produce the maximum roughing cut. and leave for removal by the operation of the finishing cutters, the mi.ni

mum amount of material; and to provide a novel, simple, inexpensive, and positively operating mechanism for this purpose.

Referring to the accompanying draw ings:

Figure 1 is a plan sectional view of a copying lathe for producing lasts in conformance with a pattern, with the lasts graded in size as desired, the same being equipped with my improvements. Figure 2 is an enlarged sectional view taken at the line 22 on Fig. 1 and viewed in the direction of the arrow. Figure 3 is a plan sectional View taken at the line 3-3 on Fig. 2 and viewed in the direction of the arrows; and Figure 4, a fragmentary sectional View of the finishing cutters taken at the line 4-4 on Fig. 3 and viewed in the direction of the arrows. The particular construction of machine which to its general features of construction is well known in the art comprises a frame 25 provided adjacent its rear side with a guideway 26 extending longitudinally thereof, and adjacent its front side with upwardly-extendingparallel guideways 27 and 28 arranged in overlapping relation as shown. Mounted on the guideways 26 and 27 is a slide 31 which carries the cutting mechanism hereinafter described, this slide beingadapted for movement lengthwise of the machine; and mounted on the guideways 26 and 28 is aslide 32 likewise movable in a direction lengthwise of the machine, this slide being provided with guides extending crosswise of the machine on which a slide 33 is mounted to be movable longitudinally thereon, this last-referred-to slide carrying the pattern follower represented at 190.

As the mechanism for rotatably support- 1923. Serial No. 050,170.

ing the pattern and work to cooperate, respectively, with the follower 190 and, the cutting mechanism referred to and mounted on the slide 31, is of well-known construction and the manner of cooperation between the follower and cutting mechanism and the pattern and the work is also well known, and

monly provided in this general type of machine, comprises a series of flatwise-disposed cutter elements 174 of successively increasing diameter, with the teeth of adjacent elements staggered, as shown in Fig. 2, these elements being rigidly mounted on a shaft 175 jpurnalled in a gear case 176 rotatably supported on a' drive shaft 177 shown as the armature shaft of a motor 178 rigidly secured to the slide 31, the shaft 177 carrying a gear 17 8 which meshes at all times with a gear 180 on the shaft 175. The finishing cutter 17 8 comprises a pair of hollow cutters 181 pivot-ally supported at 182 on oppositely ex tending ears 183 provided on the outer end of a shaft 184 journalled in a housing comprising uprights 185 provided on the slide 31 between which the gear case 176 is located, the shaft 184 extending through areshaped slots 186 in the gear case 176 and carrying a gear 187 which meshes at all times with the gear-17 9, it being understood from the foregoing that the gear connection between the drive shaft 177 and the shafts 175 and 184 operate to drive these shafts simultaneously in the same direction, the gear 187 by preference being of smaller diameter than the gear 180 whereby the shaft 184 is driven at a greater speed than the shaft 17,5.

The gear case 176 and shaft 175 are adjustable in the different positions of the shaft 177 to vary the positions of the roughing and finishing cutters relative to the work, to regulate the depth of the cut produced by the roughing cutters, the case 17 6 being provided with a lug 176 carrying a cross shaft 176 extending at its ends in arc-shaped slots 185 in the uprights 185 and provided with nuts (not shown) bearing against the outer faces ot the uprights 185 For holding the gear case 176 in adjusted position.

The hollow cutters 181 are each of the same construction. but face in opposite directions, each bcin; of general cup shape with its open end portion of cylindrical form as represented. the inner surfaces of these portions at the outer edges; being ehamtered as represented to term circular cutting edges.

ln order that the desired clearance between the cutters and the blank be presented, the axes of the shat'ts 175 and 184 are so disposed as to extend at an angle to the axis of rotation of the pattern and blank. as shown in Fin. 1, the allfllt! therein shown being approximatel 26 and the axes of the cutters 181 are disposed at at angle oblique to the axis of he shaft 181 aa shown in Fig. 4:.

Tu the 01X 'ation ot the machine the fol lower 190 and the cutting; mechanism described are -aused to more to the left in Fig. 1 in engagement with the last and blank, respectively. thereby to produce a last in conformance with the pattern.

The arrangement of the roughing and tinishine cutters and their adaptabilit tor bodily adjustmentabout the shaft 177 as an axis, is desirable as thereby the roughing cuttcramay be adjusted into ditlerent positions. as the character of worl: to be produced varies in order that they hall operate to produce the llltIJ-llltlltlll rou iz'hing cut. and leave for removal by the operation ot the finishing cutters the minimum amount of material.

hat I claim as new and desire to secure by Letters Patent. is:

A detachable unitary mount tor a cutter head for lathes mounted on the lathe tool carriage and comprising a fixed housing, a, drive gear mounted therein. spaced bearings therein in fixed relation to the drive gear, a finishing cutter hat't m unted in said spaced bearings, a gear on said shall in mesh with the drive gear, a member on said housing disposed at right" angles to mid drive gear and provided with an :u'euate slot, a movable roughing cutter near housing mounted between said v paeed liearings provided with an ear having a hole in re ister with Said slot. clamping: means extend in; through said slot and ear, arcuate openings in the side walls of said movable housing through which the finishing cutter shaft extends. a roughing cutter hat't mounted in said movable housing. and a gear on aid roughing cutter shat't continually in mesh with the drive gear in all positions of adjustment of said movable housing.

STANLEY 1C. BOYNIO Il. 

